US4598568A - Bending device for offset printing plates - Google Patents

Bending device for offset printing plates Download PDF

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Publication number
US4598568A
US4598568A US06/672,803 US67280384A US4598568A US 4598568 A US4598568 A US 4598568A US 67280384 A US67280384 A US 67280384A US 4598568 A US4598568 A US 4598568A
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United States
Prior art keywords
plate
head portion
printing
bending
printing plate
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Expired - Fee Related
Application number
US06/672,803
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English (en)
Inventor
Lothar Stadler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Assigned to HEIDELBERGER DRUCKMASCHINEN AKTIENGESELLSCHAFT, A CORP. OF GERMANY reassignment HEIDELBERGER DRUCKMASCHINEN AKTIENGESELLSCHAFT, A CORP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: STADLER, LOTHAR
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1287—Devices for attaching printing elements or formes to supports for attaching flexible printing formes devices for bending the printing plates or the printing plate ends

Definitions

  • the invention relates to a bending device for offset printing plates and, more particularly, to such a bending device having a support plate formed with a head position, a respective bending bar pivotally mounted at opposite ends of the head portion for bending respective ends of a printing plate disposed on the head portion, a lowerable down-holder member for holding a printing plate down against the head portion, and a positioning device for bending the printing plate ends in-register to given printing-plate dimensions.
  • a bending device for offset printing plates having a support plate formed with a head portion, a respective bending bar pivotally mounted at opposite ends of the head portion for bending respective ends of a printing plate disposed on the head portion, a lowerable down-holder member for holding a printing plate down against the head portion, and a positioning device for bending the printing-plate ends in-register to given printing-plate dimensions, includes adjusting means disposed parallel to the support plate between the opposite ends of the support-plate head portion, the adjusting means being movable into a plane wherein a printing plate is disposed on the head portion, so as to deflect at least part of the printing plate out of the plane.
  • the advantage of the invention is that, while employing relatively simple means and without time-consuming adjustment operations, it is possible to adjust the respective length of the bent plate to the correct elongation or expansion of the particular plate.
  • the printing need only preselect the respective extent of deflection in order to attain the optimal length i.e. the optimal clamping, for this type of plate.
  • the differences in length of the individual types of printing plates which must be taken into consideration are thereby very small and often amount to only fractions of a millimeter.
  • the adjusting means include an eccentric shaft having an eccentric rotatable outer cylindrical surface engageable with the printing plate, by turning the shaft, so as to deflect the printing plate out of the plane in which it is disposed.
  • the eccentric shaft when having a very great parallelism with the support plate, permits a highly sensitive variation or change in the length of the bend, and is set by the printer in accordance with a concomitant feature of the invention, namely, the provision of a hand-wheel mounted on the eccentric shaft for turning the shaft, and scale means disposed adjacent the hand-wheel, the eccentric shaft being adjustable by the hand-wheel in accordance with the scale means.
  • FIG. 1 is a diagrammatic side elevational view of a bending device according to the invention, with a deflected (lengthened) printing plate, (large bend length);
  • FIG. 2 is a view of the bending device similar to that of FIG. 1 wherein the printing plate has a minimal bend, (small bend length);
  • FIG. 3 is a plotted strain diagram for various printing plates
  • FIG. 4 is a somewhat enlarged, partial longitudinal sectional view of the eccentric shaft of FIGS. 1 and 2;
  • FIG. 5 is a side elevational view of FIG. 4 with the hand-wheel thereof removed, and showing the eccentric shaft and scale.
  • FIGS. 1 and 2 there is shown a bending device formed of a support plate 1 and a lowerable down-holding member 2 between which a printing plate 3 is clamped.
  • positioning means are known which are not shown in the drawing.
  • Bending bars 4 are pivotally mounted on the support plate 1 at two opposite ends of a head of the support plate, the bending bars 4, as shown in phantom, being capable of assuming an upper starting position. After the printing plate has been inserted, the bending bars 4 are moved downwardly and thus bend the printing plate ends 5 and 6 downwardly in accordance with the angular shape of the head of the supporting plate 1.
  • the dimension between the bent printing plate ends corresponds to the dimensional relations prescribed by the support plate 1.
  • the two printing plate ends 5 and 6 thus extend precisely parallel with respect to one another and are angled off slightly shorter than would be required by the purely theoretical clamping length on the printing plate cylinder.
  • the force necessary for elongating or expanding the plate exerts a tangential clamping force on the plate which ensures snug clamping of the latter and good seating thereof on the plate cylinder.
  • adjusting means in the form of an eccentric shaft 7 which extends parallel to the support plate 1.
  • an eccentric outer cylindrical surface 8 By turning the eccentric shaft 7, it is possible to raise an eccentric outer cylindrical surface 8 or lesser extent relative to the plane in which the support plate 1 is disposed, so that when a new printing plate 3 is placed in position, it is deflected out of a straight line or the plane when clamped down by the down-holding member 2.
  • a recess 9 is provided in the down-holding member 2.
  • This deflection of the printing plate 3 out of the straight line or plane in which it is originally disposed causes a lengthening or expansion of the distance between the two bending edges on the support plate 1. This relatively small deflection makes it possible to reduce the strain of the clamped printing plate on the plate cylinder.
  • FIG. 3 is a plot diagram showing the tangential clamping force F along the ordinate, and the strain travel ⁇ s along the abscissa.
  • the straight line ⁇ 1 represents, for example, the increase in the strain in the case of an increasing clamping force for a bimetallic plate and ⁇ 2 the strain behavior of an aluminum plate.
  • the line 10 represents the ideal clamping force, it being clearly apparent that the strain travel at ⁇ s is off different length for the two aforementioned types of printing plates.
  • FIGS. 4 and 5 show the eccentric shaft 7 with its eccentrically offset journal 11 which is held in a bearing block 12 which, in turn, is mounted on a base plate 13 together with the support plate 1.
  • a hand-wheel 15 by means of which the eccentric shaft 7 can be turned with great sensitivity.
  • a disc 16 with a scale 17 which, in conjunction with an arrow 18, indicates the respective adjustment position or setting.
  • the setting 19 might, for example, be provided for the aluminum plate, and the setting 20 for the bimetallic plate.
  • a spring-supported ball-type catch 21 is provided.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
US06/672,803 1983-11-19 1984-11-19 Bending device for offset printing plates Expired - Fee Related US4598568A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3341924A DE3341924C2 (de) 1983-11-19 1983-11-19 Biegevorrichtung für Offsetdruckplatten
DE3341924 1983-11-19

Publications (1)

Publication Number Publication Date
US4598568A true US4598568A (en) 1986-07-08

Family

ID=6214786

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/672,803 Expired - Fee Related US4598568A (en) 1983-11-19 1984-11-19 Bending device for offset printing plates

Country Status (4)

Country Link
US (1) US4598568A (en)van)
EP (1) EP0142728B1 (en)van)
JP (1) JPS60120058A (en)van)
DE (1) DE3341924C2 (en)van)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5007264A (en) * 1987-11-19 1991-04-16 Feintool International Holding Method and apparatus for the bending of workpieces
DE3938477A1 (de) * 1989-11-20 1991-05-23 Koenig & Bauer Ag Druckplattenabkantvorrichtung
US5987949A (en) * 1997-03-18 1999-11-23 Heidelburg Harris, Inc. Plate scanner--bending device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539586A1 (de) * 1985-11-08 1987-05-14 Roland Man Druckmasch Verfahren zum aufbringen eines schutzbelages auf einen druckwerkzylinder mit vorrichtungen zur durchfuehrung des verfahrens
DE3943566A1 (de) * 1989-11-20 1991-05-23 Koenig & Bauer Ag Druckplatte
DE4306237A1 (de) * 1993-02-27 1994-09-01 Heidelberger Druckmasch Ag Einrichtung zur Einstellung des Schrägregisters in einer Spanneinrichtung zum Einspannen von Druckplatten in einer Offsetdruckmaschine
DE19516368C2 (de) * 1995-05-04 1999-09-23 Neumeister Geb Gmbh Verfahren und Vorrichtung zur Anpassung der Lage von Druckplatten an die Verformung des zu bedruckenden Papieres
US5699740A (en) * 1996-06-17 1997-12-23 Creo Products Inc. Method of loading metal printing plates on a vacuum drum
DE10338374A1 (de) * 2003-08-21 2005-03-17 Koenig & Bauer Ag Vorrichtung zum Zuführen von Druckplatten zu einer Druckplattenwechsel-Einrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US412254A (en) * 1889-10-08 Mills
US864325A (en) * 1906-05-04 1907-08-27 Mcdonald Machine Company Can-forming machine.
US1710985A (en) * 1927-01-31 1929-04-30 Monighan Mfg Corp Excavating-bucket-forming machine
US2190423A (en) * 1937-12-06 1940-02-13 Motor Products Corp Windshield frame bending machine
GB983523A (en) * 1962-10-11 1965-02-17 Rubery Owen & Company Ltd Improvements relating to load-supporting plates or panels
US3677059A (en) * 1971-02-19 1972-07-18 Burroughs Corp Lithoplate bender
JPS5338263A (en) * 1976-09-21 1978-04-08 Toshiba Corp Plasma treating apparatus of semiconductors

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2036490A1 (de) * 1970-07-23 1972-01-27 Maschf Augsburg Nuernberg Ag Verfahren und Vorrichtung zum paßgerechten Befestigen biegsamer Druckplatten auf, dem Formzylinder von Mehrfarben-Bogenoffset-Rotationsdruckmaschinen
US3733872A (en) * 1971-07-15 1973-05-22 C Gregoire Roller bender for offset printing plates
DE2628249C3 (de) * 1976-06-24 1984-08-02 Heinz 5653 Leichlingen Metje Biegevorrichtung für Offset-Druckplatten
DE3221489C2 (de) * 1982-06-07 1985-03-28 Heinz 5653 Leichlingen Metje Biegevorrichtung für Offsetdruckplatten

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US412254A (en) * 1889-10-08 Mills
US864325A (en) * 1906-05-04 1907-08-27 Mcdonald Machine Company Can-forming machine.
US1710985A (en) * 1927-01-31 1929-04-30 Monighan Mfg Corp Excavating-bucket-forming machine
US2190423A (en) * 1937-12-06 1940-02-13 Motor Products Corp Windshield frame bending machine
GB983523A (en) * 1962-10-11 1965-02-17 Rubery Owen & Company Ltd Improvements relating to load-supporting plates or panels
US3677059A (en) * 1971-02-19 1972-07-18 Burroughs Corp Lithoplate bender
JPS5338263A (en) * 1976-09-21 1978-04-08 Toshiba Corp Plasma treating apparatus of semiconductors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5007264A (en) * 1987-11-19 1991-04-16 Feintool International Holding Method and apparatus for the bending of workpieces
DE3938477A1 (de) * 1989-11-20 1991-05-23 Koenig & Bauer Ag Druckplattenabkantvorrichtung
US5094095A (en) * 1989-11-20 1992-03-10 Koenig & Bauer Aktiengesellschaft Printing plate bending apparatus
US5987949A (en) * 1997-03-18 1999-11-23 Heidelburg Harris, Inc. Plate scanner--bending device

Also Published As

Publication number Publication date
DE3341924A1 (de) 1985-05-30
EP0142728B1 (de) 1989-01-11
JPH0418548B2 (en)van) 1992-03-27
EP0142728A3 (en) 1986-02-19
DE3341924C2 (de) 1987-03-26
JPS60120058A (ja) 1985-06-27
EP0142728A2 (de) 1985-05-29

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Owner name: HEIDELBERGER DRUCKMASCHINEN AKTIENGESELLSCHAFT, HE

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362